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I think you're going off the deep end your first time out.

I mean you've got spells layed out for a Sorcerer 20 and while it is fine to have some idea where you want to get you need to get your feet wet first.  You should start playing at a MUCH lower level and see how things evolve.

Now if you are jumping it as a high level spellcaster then Sorcerer is the way to go but it is hard and you really should have more input from your play group and DM.  One thing about a Sorcerer is that you should try to vary to spells known a bit and not stick too strongly to any single themes as it can cripple you.   

Playing a sorcerer is definitely not for the meek.  They're certainly one of my favorites, preceded by warmage and bard.  frankly, I'd suggest one of them first as they're both much easier to play.

that being said, a sorc can be loads of fun.  Here are a few great questions to ask.

First, of the other spellcasters in the party, do they prefer save vs. die, save vs. suck, or direct damage?  If they like direct damage, do they prefer area attacks or targeted attacks?

Next, how are they at the utility spells?  Do they have any illusions?  Do they like to use spells that allow rearranging things (such as stone shape, disintegrate, and the such)?  If they are weak on these, consider taking a few that are perfect for your type of adventure.  Don't underestimate walls, but then again, don't get too many of them.

Escape spells!  Due to your general weakness in melee, you should consider how you'd like to leave combat should it become too much.  I love invisibility and teleport options.  You can also use polymorph spells to escape easily.

Now, since your main goal is to become the heavy damage dealer, what kind do you prefer?  Getting up and dirty, staying far away, or hitting as many as you can (even if it hits your own people too)?  Lines are far easier to control for avoiding friendly fire than other area spells, but they're just as non-discriminating. 

Protection:  Don't forget to get some easy to use spells that will stop fire, acid, blah blah blah.  On the other hand, you can also invest your money in it.  Dispel Magic is also very useful. 

If you've been lurking on these forums for a while, you'll have read some very interesting discussions on what you can do with various spells.  Sometimes you might not think of them on the fly, so I'd strongly advise going back over a few of them.

Fun things like stacking wall of fire to deal extra damage.  Each will deal damage individually, so they dont' do squat against fire resistant foes, or those with high saves, but all the same, lots of damage.

Take the feat Rapid Metamagic from Complete Arcane.  Preferably at level 3 or 6.